I really don't know. The dialogue seems to be limited to switching on or of the samba share and UPnP. I did find pretty involved post, in German where I think someone was doing what I think you're suggesting.
OK this is on hold for now, family beckons!

Well that looks like one of those network issues that just resetting stuff and giving it time might help.
I searched with win explorer and confirmed X10\MusicDB
Then in win scp the new folder x10Music actually showed album names.
Switching library on the joggler back to open frame showed x10Music as an available folder.
Going into this now lists the album names, but there's no content.
Time to scan? I'll try

OK. Not sure what happened now. I rebooted the joggler with lms running on it. I also switched off the PC in case that was helping to find the network share in some way. Well now there's nothing at all under x10Music like it didn't find the networked X10 at all, despite the fstab file. ???